How can i use standard intel video card and add-in ati 2400 together?

i have 2 monitors and a add-in ati 2400 pciE and a standard intel vga card. i can only use 1 at a time. how can i use both simultaneously?|||To use 2 monitors at the same time, you need a video card with 2 outputs. Rarely do you find a motherboard that will allow you to use both the onboard video and a video card at the same time. Check you BIOS to see what options you have.